Despite heavy rain and expected gales, hundreds of teenagers from the region are on Dartmoor this weekend taking part in the Ten Tors Challenge.
The Army and emergency services are on standby in case conditions worsen and spectators are being advised that the car parks are closed as they're already too muddy.
Over 50 schools and youth groups from the West have sent teams to take part in the event - which has courses between 35 and 55 miles.
For a list of teams taking part visit the official Ten Tors website.
The Director of theTen Tors Challenge says a group of teenagers who had to be airlifted to safety whilst training for the event followed the safety procedures put in place by the army.
Brigadier Piers Hankinson says he's pleased that their ethos of 'safety' was upheld.
The 14-year-olds were practicing for the annual Ten Tors trek across Dartmoor when they became disorientated in low cloud yesterday afternoon.
Read the full statement below:
Police say seven teenage boys have been airlifted to safety by helicopter after getting lost on Dartmoor. The 14-year-olds were practicing for the annual Ten Tors trek across the national park when they became disorientated in low cloud yesterday afternoon.
The boys were from a school in Wiltshire.